大规模风电场接入对电力系统调峰的影响

Impact of Large-Scale Wind Farm Connecting With Power Grid on Peak Load Regulation Demand

大规模风电基地的快速建设,使系统调峰成为电网运行的新难题之一。针对风电出力随机性强、运行方式复杂多变的特点,通过对规划年份时序负荷曲线与风电出力时序曲线的模拟,从一个新的角度分析了大规模风电对系统调峰的影响。还讨论了风电出力对系统峰谷差的影响机理,并引入评价指标体系,深入研究了大规模风电基地接入后系统等效负荷峰谷差的变化及分布规律。进一步分析了在各种外送模式以及系统调峰协调方式下,大规模风电基地对系统调峰的影响规律。以我国甘肃酒泉风电基地为对象进行分析和论证,并根据分析结果对甘肃电源规划与调度运行方式提出了建议。

At present large-scale wind farms are being constructed in China at a fast pace and they will be connected with power grids, it makes the peak load regulation of power grid becoming one of new puzzles in the operation of power grid containing wind farms. Considering the random nature of wind power output and complicated and changeable operation modes of wind farm, by means of simulating annual chronological load time series and chronological time series of wind power output in the planned year, the impacts of large-scale wind farm on power system peak load regulation are analyzed in a new viewpoint. The impacting mechanism of wind power output on difference between peak load and valley load of power grid is analyzed, by way of leading in a new evaluation index system the variation of peak-to-valley difference of equivalent load of power grid with large scale wind farm connected and its distribution are researched in detail. The influencing laws of large-scale wind farm on system peak load regulation under various outward power transmission modes and coordinative system peak load regulation modes are further analyzed. Selecting the wind farm base located in Jiuquan, Gansu province as the object, the wind power planning and the dispatching and operation of Gansu power grid are analyzed and demonstrated, and based on the analysis results some suggestions of generation expansion planning and operation mode for Gansu power grid are proposed.